author(s)
Iloba Kate Isioma and Edeghagba O Stephany

abstract
The evaluation and documentation of physical and chemical limnology and algae of floodplains is paramount in fisheries development in Nigeria. The algae community of the Aghalopke floodplain was studied weekly between April and May, 2015. The water quality variables varied significantly at all sites (p<0.05) except carbon dioxide (p = 0.2110) and will favour fisheries development, with the good acidity- alkalinity neutralizing interactions structuring the floodplain. The phytoplankton community structured by 33 species of six genera and four taxa; Bacillariophyta (6), Chlorophyta (7), Cyanophyta (3) and Euglenophyta (17). The organic loving - euglenoids dominated over 80% of the algae community while less than 20% were apportioned between Bacillariophyta (6.8 %), chlorophyta (7.6 %) and cyanophyta (0.4%). Dissolved oxygen (r= 0.7374; p=0.0149) and total dissolved solids (r= 6514; p=0.0413) only correlated significantly with the euglenophytes (p≤ 0.005). The diversity indices (0.40 – 0.828) confirmed the poor quality status of the floodplain and the Palmer pollution index identified the floodplain as organically polluted.